System and method for receiving requests for tasks from unregistered devices

A computer-implemented method, comprising:

• performing, by one or more computers:
• receiving a message from a communication device, the message indicating a request to purchase an item;
• determining that said communication device is not registered with an existing account that includes billing information previously submitted by a user for performing purchases;
• obtaining from the unregistered communication device via a communication channel, identification and authentication information for the existing account that includes the previously-stored billing information;
• wherein said existing account is accessible through a network-based interface;
• wherein said communication channel does not include said network-based interface;
• validating the identification and authentication information from the unregistered communication device as being correct relative to identification and authentication information previously-submitted by said user through the network-based interface, and in response to that validation:
• complete the purchase of the item with the previously-submitted billing information of the existing account;
• and
• register the communication device for subsequent access to the existing account through the communication channel with new authentication information.

A non-transitory computer-readable storage medium storing program instructions computer-executable to implement a communication interface service configured to:

• receive a message from a communication device, the message indicating a request to purchase an item;
• determine that said communication device is not registered with an existing account that includes billing information previously submitted by a user for performing purchases;
• obtain from the unregistered communication device via a communication channel, identification and authentication information for the existing account that includes the previously-stored billing information;
• wherein said existing account is accessible through a network-based interface;
• wherein said communication channel does not include said network-based interface;
• and
• validate the identification and authentication information from the unregistered communication device as being correct relative to identification and authentication information previously-submitted by said user through the network-based interface, and in response to that validation:
• complete the purchase of the item with the previously-submitted billing information of the existing account.